NDLI: Effect of Phonon Dispersion on Transport Properties of Single-Crystalline Dielectrics

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Asheghi, Mehdi Liu, Wenjun Goodson, K. E.
Copyright Year	2004
Abstract	Thermal conductivity modeling using the Debye approximation can significantly reduce the complexity involved in the evaluation of thermal conductivity integral. Nevertheless, there are several compelling reasons (e.g., inconsistency between the estimations of the density of states used for heat capacity and thermal conductivity) that motivate more detailed modeling of the phonon dispersion in silicon or other diamond-like dielectrics. This manuscript presents closed-form expressions for the dispersion of the longitudinal and transverse modes in diamond-like dielectrics, which are then used to estimate the isotopic scattering rate, phonon spectrum and specific heat. The combinations of the above parameters are then used to predict the thermal conductivity of the bulk silicon and germanium with orders of magnitude variation in the mass fluctuation of isotopes and for the temperature range 2 to 1000 K. While this approach offers an elegant and consistent account of the phonon dispersion in diamond-like materials, however, provides no additional insight into the relative contributions of the longitudinal and transverse phonons to the heat transport.
Sponsorship	Electronic and Photonic Packaging Division
Starting Page	113
Ending Page	123
Page Count	11
File Format	PDF
ISBN	0791847071
DOI	10.1115/IMECE2004-62244
Volume Number	Electronic and Photonic Packaging, Electrical Systems Design and Photonics, and Nanotechnology
Conference Proceedings	ASME 2004 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2004-11-13
Publisher Place	Anaheim, California, USA
Access Restriction	Subscribed
Subject Keyword	Radiation scattering Temperature Approximation Scattering (physics) Dielectric materials Phonons Diamonds Heat capacity Modeling Density Specific heat Heat Electromagnetic scattering Thermal conductivity Germanium Silicon Isotopes
Content Type	Text
Resource Type	Article

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